The final episode of Late Night With Jimmy Fallon airs Friday, and Fallon takes over The Tonight Show starting Feb. 17.

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It was a blast from the past a minute for Jay Leno while taping his final episode of The Tonight Show.

But after Seth MacFarlane popped up unexpectedly last week to join Bill Maher for a "Thanks for the Memories"-style tribute, Leno didn't really think that regularly scheduled guests Billy Crystal and Garth Brooks would be the only ones who showed up to see him off, right?

Sure enough, the celebrity cameos were many, and even those who both sat in the guest's chair and were the target of a lot of his jokes over the years came to say goodbye. Or, in this case, sing "So Long Farewell."

Actually, Kim got off pretty easy compared to some. An official tally compiled by the Center for Media and Public Affairs at George Mason University showed that the biggest target was on Bill Clinton's back, the scandal-tinged former president leading all famous types with 4,607 jokes cracked at his expense--1,368 more than runner-up George W. Bush.

"Boy, this is the hard part," an emotional Leno said toward the end of the taping. "I want to thank you--the audience. You folks have been just incredibly loyal and... this is tricky...We wouldn't be on the air without you people. Secondly, this has been the greatest 22 years of my life."

"I am the luckiest guy in the world," he added. "I got to meet presidents and astronauts and movie stars. It's just been incredible."

The final episode of Late Night With Jimmy Fallon airs Friday, and Fallon takes over The Tonight Show starting Feb. 17.